In the context of computational learning, the concept of 'probably approximately correct' (PAC) learning provides a framework for understanding the efficiency and feasibility of learning algorithms.

治理质量是经济发展的关键决定因素。

历史不仅仅是过去的故事，它也是现在的镜子和未来的窗口。

无论多难，我们都不会放弃。